Assiotob to american chad



T. C. LUCE.

EXTENSION HEAD LIFTING JACK.

APPLICATION FILED NOV-6,1915.

L1 9 7.. Patented Aug. 1, 1916.

If i 1/ v a g,

1 TED STATES TE 1;

'rnomas 0. won, or STRATFORD, oommc'rrcur, ASSIGNOR 'ro memos): c COMPANY, mconrormrnn, or BRIDGEPORT, commcrrcur; a conrona'rron or NEW YORK.

To all whom it may concern v Be it known that I, THOMAS C. LUCE, a citizen of the United States, and resident of Stratford, Fairfield county, Connecticut,- have made a certain new and useful Invena somewhat diagrammatic way an'illustra tive embodiment of this invention, Figure 1 is an elevation partly in section. Fig. 2 is a partial elevation showin the extension head being raised. Fig. 3 1s an enlarged sectional view taken substantially along the line '3-3 ofFig. 2; and Fig. 4 is a sectional elevation taken substantially along the line 4-4 of Fig. 2.

The jack may comprise a frame 2 having a suitable base 1 secured thereto and having the lifting head 11 connected to the lifting screw 12. This lifting screw may 006p crate with the nut 4 revolubly mounted in the frame and rotated by any suitable actuating connections from the endless operating chain 26, for instance, which as indicated may cooperate with the guide casing 3 swivelingly mounted on the shaft 30, these actuating connections being if desired in substantial conformity with the Lashar- Luce application 16,875 of March 25, 1915, on which this invention is based, it being understood that the details of these actuating connections form no part of the present invention, and if desired the jack may be actuated by suitablecapstan bars or rods cooperating with the nut in any suitable way as by entering the holes34 therein.

For many classes of automobile service a lifting jackmust when in lowered position be relatively short so as to be placed under the low hung axles or other parts-of the machine to, be lifted and at the same time the jack must be capable of relatively great extension to take care of extreme conditions of lift. For such service the jack may with EXTENSION-HEAD LIFTING-J'ACK.

Specification of Letters Patent.

' Patented Aug. i, ieie.

Application filed November 0, 1915. Serial No. 59,898.

extension head or extension member' which may be readily secured. in position on the lifting head and adjacent parts of the jack and preferably be so constructed as to support the load While the head is being retracted to allow an additional lifting movement to take place. For this purpose the extension head may with advantage be formedof heavy sheet steel or any other suitable material, preferably in more or less tubular form so as to constitute a channel in WhICh the head of the jack may operate and if desired, this extension member may comprise the back 10 forged or otherwise formed m connection with the side members 8 and cooperatingfront holding flanges 9 which may approach sufliciently to maintain alinenent with thehead 11 of the jack, as shown in Fig. 3, while at the same time providing a screw slot or channel' between them to facilitate the positioning of the extension head formed with a load engaging upper portion 13of any desired form which may with adv vantage in some cases be given the concave form indicated which minimizes slipping and the lower portion of this extension member may be flanged or folded inward at 18 so as to form a neck 19 which may closely embrace the screw so as to hold the lower end of the-extension member in alinement therewith in connection with suitable retainer devices, when the extension head is secured to the head or other lifting portions of the jack as by the lifting pin 22. V This lifting pin as indicated in Fig 4 may pass through the sides'of the extension head, the 1 hole or aperture 23 being preferably formed with its upper side in line with the hole on the opposite side of the extension head so that whenin lifting position this pin will properly and evenly engage the lifting head of the jack. This lifting pin may have a flanged end 17 which may be gripped by the latch 14 provided with a. latch socket 21 to closely engage this lifting pin adjacent its end. This latch may as indicated have a slot 15 through which screws or rivets 16 I may extend so as to hold this latch in slidable engagement with the side of the extension head and allow of its convenient actuation by a projection or handle 21. The lift ing pin can thus be pushed across the extenthe extension head in front laterally so that sion head above the lifting head 11 so that the end of this lifting pin passes through the hole or aperture 23 and is then secured in thislifting position by the latch 14, the extension head then being firmly secured to the head and screw of the jack and acting in unison therewith as long as it is desired to provide the jack with such an extension.

The retainer devices may comprise the bar 20 movably mounted in suitable slots so that it may be pushed across the neck of of the lifting screw 12 and held in this position frictionally or by any desired locking means, as for instance by the spring locking member 27 formed of resilient material in any suitable way as by cutting the slot 28 through this part of the retainer bar 20 which may be formed with a suitable head or extension 24 at its otherend'so that it is securely held in position when this locking member snaps up under the edge of its slot as indicated in Fig. 4. At the same time this locking member is so thin that it may be readily forced down by the operator and then the retainer bar may be withdrawn this slightly projecting locking member enters the recess 31 which entirely clears the neck of the extension head, while at the same time preventing en tire disengagement of this retainer bar.

Under service conditions it often happens that the total lift desired is beyond thenormal lift capacity of the jack itself and in such cases the load may be raised by the lifting member 11 of thejack and then while the load is retained in this raised position the extension head may be positioned and secured in alinement so that it can sustain the load in connection with the'cooperating jack frame is being retracted sufficiently to allow the lifting pin or other device to secure the extension head to the lifting head for further raising of the load. If, for example, the jack has raised its load so that the head of the jack 11 is about the position shown in Fig. 1 or a little higher the extension head may then be inserted beneath the load by passing its slotted upper end around the lifting screw 12 and beneath the lower part of the lifting head secured thereto, the exten sion head then being raised around said lifting head so as to assume about the position shown in Figs. 1 and 3. The retainer devices may then secure the extension head in position as by pushing across the retainer bar and latching the same if desired, or if desired suitable depending retainer lugs, such as 25, may also be formed on the lower part of the extension member so as to look over the cooperating part of the nut or lifting device of the jack. A reverse movement of the jack may now-take place so as to lower the lifting headll while the load is 5, interposed between while the lifting head of the jack being sustained by the extension head, and for this purpose it is sometimes desirable to provide the nut with a suitable relatively rotating cap, such as 6, which may have suitable bearing members or anti-friction balls it and the upper part of the nut and which may, if desired, have the inturned securing flange or members 7 loosely engaging a cooperating annular recess in the nut. This arrangement serves to minimize friction during the lowering operation. When the lifting head has been low ered or retracted within the tubular extension head in the direction indicated by the arrow in Fig. 1 so that it reaches the dotted line position, the lifting pin 22 may thereupon be projected acrossthe extension head so as to secure these parts in lifting relation and thereupon if the jack is operated so as to raise the lifting head, the attached extension head is correspondingly lifted and the load may be raised through an additional 'four or five inches which is often of vital importance in automobile work. In lowering the load under such conditions the reverse operations take place, that is, the load on the extension head is lowered until this extensionhead engages the nut or cooperating parts of the Jack and the coupling devices or lifting pin may then be detached and the lifting head of the jack may be raised so that it again directly engages the load and raises it sufficiently to allow the lifting head to be disengaged and removed after which the load may be completely lowered in the ordinary way.

This invention has been described in connection with-a number of illustrative embodiments, forms, parts, proportions, materials and arrangements, to the details of which disclosure the invention is not of course to be limited, since what is claimed as new and what is desired to be secured by Letters Patent is set forth in the appended claims.

I claim:

1. In lifting jacks for automobiles and so forth,a short supporting frame, a. lifting head and an attached screw lifting member mounted in said frame, a lifting not having threaded engagement with said lifting member, a relatively rotating cap mounted on said nut and an extension head adapted to disengageably cooperate with said lifting head and lifting member and formed with a screw slot to pass around said screw and having its upper portion in the form of a channel to accommodate said lifting head, a lifting pin cooperating with said extension head and detachably latched across said channel to have lifting engagement with said lifting head and retainer devices to hold the lower part of said extension head in substantial alinement with said lifting member and comprising a retainer bar havand retainer devices to hold the lower of said. extension head in substantial aline- I lifting member.

I forth, a supporting ing a locking member to releasably Hold it in retaining position and depending'retainer lugs adapted to coiiperate' with the upper parlt1 of said cap to maintain alinement therew1t 2. In lifting jacks for automobiles and so forth, a short supporting frame, a lifting head and an attached screw lifting member mounted in said frame, a lifting nut having threaded engagement with said lifting member and an extension head adapted to disengageably coiiperate with" said lifting head and lifting member and formed with a screw slot, to pass aroundsaid screw and having its upper portion in the form of a channel to accommodate said lifting head, a lifting pin cobperating with said extension head tohave lifting engagement with said lifting head part ment with said Iiftingmember.

3. In lifting jacks for automobiles and so forth, a short supporting frame, a lifting head and an attached screw lifting member mounted in said frame, a supporting member located adjacent the top of said frame past which said lifting member passes and an extension head adapted to disengageably' cooperate with said lifting head and member and slotted to be passed around said lifting member and raised around said lifting head and adapted to support a load from said supporting member while said lifting head is lowered within said extension head, coupling-devices disengageably coupling said extension head with a lifting memberof the jack and retainer devices to hold the extension head in substantial alinement with such 4. In lifting jacks for automobiles and so forth, a supporting frame, a lifting head and an attaching lifting member mounted in said frame, a supporting member located adjacent thetop o said'fra'me past which said lifting member passes and an extension head having a channeled upper. portion adapted to disengageably coiiperate with said lifting head and member and slotted to be passed around said lifting member and raised around said liftin head adapted to support a load from said supportlng member while said lifting head is lowered within said extension head, and coupling devices disengageably couplingv said extension head with a lifting member of the jack.

5. In lifting jacks for automobiles and so and an attached llfting member -mounted in said frame, a supporting member lo-' fcated adjacent the top of sa1d frame past which said lifting member passes and an extension head adapted to dlsengageablycooperate with said lifting head and member and be passed around said lifting member and raised around 'saidlifting head and frame, a lifting head adapted to support 'a load from said sup-' porting member while said lifting head is lowered within said extension head, and

-6. In lifting jacks for automobiles and so a forth, a short supporting frame, a lifting head and an attached screw lifting member mounted in said frame, and an extension head adapted to disengageably cobperate with said-,liftinghead and liftlng member and formed with a slot hfting member and having its upper portion formed as a channel to-accommodate said lifting head, coupling devices comprising a lifting pin coeperating with said extension head and detach-ably latched across said channel to have lifting engagement with said lifting head andretainer devices to hold the lower part of said extension head insubstantial alinement with said lifting member and comprising a retainer bar having a looking member to'releasably' hold it in retaining position.

7. In lifting jacks for automobiles and so forth, a supporting frame, alifting head and an attached lifting member mounted in said frame, and an extension head adapted to disengageably cobperate with sa d lifting head and lifting member and formed with a slot to pass around, said lifting member and 'having its upper portion formed as a channel to accommodate said lifting head, coupling devices comprising a lifting pin coiiperating with said extension head to have'lifting engagement with said lifting head and retainer devices to hold the lower part of said extension head in substantial alinement with said lifting member and comprising a retainer bar. v

. 8. In lifting jacks for automobiles and so forth, a supporting frame, a lifting head and to pass around said an attached lifting member mounted in said member.

9. In lifting jacksfor automobiles and so forth, a. supporting frame, llfting means comprising a lifting head and an attached lifting member mounted in said frame and an extension head ada ted to disengageably 'coiiperate with said li ting head-and lifting member and formed with a slot to pass around saidlifting member and having ts upper portion formed to accommodate sa1d iifting head, and coupling devices disengageably coupling said extension head said lifting means of the jack.

10. In lifting jacks for automobiles or the like, a supporting frame, lifting means comprising a lifting member mounted to move longitudinally of said jack and an extension head having an outer portion formed to allow the free movement of said lifting member longitudinally of the jack past said ex tension head, coupling devices on said extension head to detachably couple the same with said lifting means of the jack and means on said extension head to engage said acl; and support the load during the backward movement of said lifting member.

11. An extension head adapted to be used with automobile or other lifting jacks having a frame and having lifting means comprising a lifting head and member mounted in said frame, said extension headhaving a channeled upper portion formed to accommodate the lifting head of the ack and allow vertical movement thereof and slotted to be passed around said lifting member and raised around said lifting head beneath a load, coupling devices on said extension head to detachably couple the same with the lifting means of thejack and comprising a coupling pin permanently secured thereto and adapted to be temporarily extended and latched across said channel and retainer devices adapted to hold said extension head in substantial alinement with said lifting member.

12. An extension with automobile or other lifting jacks having a frame and having lifting means comprising a lifting head and attached lifting member mounted in said frame, said extension head having a channeled upper portion formed to accommodate the lifting head of the jackand allow vertical movement thereof and slotted to be passed around said lifting member and raised around said lifting head beneath a load, coupling devices on said extension head to detachably couple the same with the lifting means of the jack and comprising a coupling pin permanently secured thereto and adapted to be temporarily extended across said channel.

13. An extension head adapted to be used with automobile or other lifting jacks having a frame and having lifting means comprising a lifting head and attached lifting member mounted in said frame, said extension head having an upper portion formed to accommodate the lifting head of the jack with attached liftingv head adapted to be used and allow vertical movement thereof and adapted to be passed around said lifting member and raised around said lifting head beneath a load, and coupling devices on said extension head to detachably couple the same with the lifting means of the jack.

14:. An extension head adapted to be used with automobile or other lifting jacks having a frame and having lifting means comprising a lifting head and attached lifting member mounted in said frame, said extension head having an upper portion formed to accommodate the lifting member of the jack and allow vertical'movement thereof and adapted to be passed around said lifting member and raised beneath a load, coupling devices on said extension head to detachably couple the same with the lifting means of the jack and retainer devices adapted to hold said extension head in substantial alinement with said lifting member.

'15. An extension head adapted to be used with automobile or other lifting 'jacks having a frame and supporting member and having lifting means comprising a lifting member mounted in said frame, said extension head having an upper portion formed to allow the free vertical movement of the lifting member of the jack past the same, coupling devices on said extension head to detachably couple the same with the lifting means of the jack and means on said extension head to engage a supporting membet on said jack to support the'load during the downward movement of said lifting member. y

16. An extension head adapted to be used with automobile or other lifting jacks having a frame and supporting member and having lifting means comprising a lifting member mounted in said frame, said extension head having load engaging members to engage a load on opposite sides of the lifting member of the jack and allow the free forward movement of said lifting member longitudinally of the jack past said extension head, coupling devices on said extension head to detachably couple thesame with the lifting means of the jack and means on said extension head to engage a supporting member on said jack to support the load during the backward movement of said lifting member.

- THOMAS C. LUGE.

Witnesses:

WALTER F. FITZGERALD, WM. C. ETTERSHANK. 

